Two teens have been charged over an attack on a pair of WA policemen that landed one officer in hospital with a concussion.
Police were originally called over a group of youths behaving disorderly, smashing bottles and drinking alcohol near the Madora Bay lookout at 7pm on Saturday.
Some of the teens moved on to a Lakelands home, where they turned on police.
A Mandurah Police Station sergeant was hit in the back of the head and taken to Peel Health Campus where he stayed overnight for a serious concussion and soreness to the skull and shoulder, police say.
A senior constable was also hit and bruised in the incident.
Two 17-year-olds have been charged with assaulting a public officer and will both appear in the Mandurah Children's Court on June 19.